book Maths Puzzle Numerical Ability

Bob was taking a 500-mile round trip. After driving for 5 1/2 hours at an average speed of 42 miles per hour, how many miles did he have left to drive?

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book Other Question

Science and medicine. Celsius temperature readings can be converted to Fahrenheit readings using the formula F=9/5C + 32. What is the Fahrenheit temperature that corresponds to each of the following Celsius temperatures:
-10, 0, 15, and 100?
X2 + y2 = 25 where Y =3

what is the answer? Please Please Please and how did you arrive at it.

9
5
16
4
Thank you so very much inadvance.
trica.